Parosus gigantulus, Makranczy & H-, 2014

Makranczy, György, 2014, Review of the genus Parosus Sharp, 1887 (Coleoptera: Staphylinidae, Oxytelinae), Revue suisse de Zoologie 121 (1), pp. 77-133 : 98-100

Parosus gigantulus sp. nov. Figs 1-14, 28, 50, 71-73, 89

TYPE MATERIAL: HOLOTYPE (3), “COLOM[BIA:] [Departamento del] Magd [alena], San Lorenzo , 41km S Sta. Marta [11°06'16"N, 74°04'04"W], V-3-1973, [leg.] Howden & Campbell” ( CNCI) . – PARATYPES (2), COLOMBIA: Departamento del Magdalena, San Lorenzo , 41km S Santa Marta, 03.V.1973, leg. Howden & Campbell ( MHNG, 1♀) , same but 06.V.1973 ( CNCI, 1♀) .

DESCRIPTION: Habitus as in Fig. 50. Measurements (n=2): HW = 1.03 (0.94-

1.12); TW = 1.03 (0.91-1.15); PW = 0.96 (0.88-1.04); SW = 0.99 (0.94-1.04); MW =

FIGS 52-59

(52-55) Parosusantillarum sp. n.; head (52), pronotum (53), elytron (54), sideofhead (55). (56-59) P. bicoloratus sp. n.; head (56), pronotum (57), elytron (58), sideofhead (59). AllSEM, dorsal views. Scale bar = 0.12 mm for 55, 0.15 mm for 59, 73, 0.4 mm for 52-54, 0.5 mm for 56-58.

1.15 (1.08-1.21); AW = 0.91 (0.87-0.95); HL = 0.78 (0.72-0.84); EL = 0.18 (0.17-0.18); FL = 0.15 (0.14-0.15); TL = 0.33 (0.28-0.37); PL = 0.69 (0.62-0.75); SL = 1.07 (1.00- 1.14); SC = 1.07 (1.01-1.12); FB = 2.70 (2.55-2.85); BL = 5.23 (4.55-5.90) mm. Body 'unicoloured'. Head blackish dark brown (supraantennal prominences lighter, light brown to orange), pronotum reddish dark brown (sometimes a little lighter than head), elytra and abdomen reddish medium to dark brown (often abdomen darkening towards apex, tergite VII reddish dark brown). Legs, mouthparts and antennae reddish medium brown, apex of antennomere 2 and antennomeres 3-10 are darker). Pubescence rather sparse and rather short, except abdomen, where longer.

Head and pronotum. Mid-antennal articles moderately elongate (antennomere 6 length:width = 0.100: 0.090 mm). Clypeus (Fig. 71) trapezoid, ratio of longitudinal distance of supraantennal prominence tip from eyefront to the same from clypeal front = 0.85-0.88. Infraocular ridge (Fig. 73) strong, running well behind the eye. Temple straight or slightly dilating in anterior 2/5, slightly angled. Pronotum (Fig. 71) with maximum width 1.74x base width, anteriorly sides almost straight, angles sharp. Behind clypeal area with shallow to medium deep concavities on vertex and on pronotal disc (especially before middle of midline). Supraantennal prominences and clypeal area almost totally unpunctured, only a few small and simple punctures. In posterior half of pronotal midline with an unpunctured, shiny stripe (slightly elevated). Head with 28-30 'longitudinal' puncture lines, pronotum with 28-30 'longitudinal' puncture lines, punctation on mid- and anterior vertex loosened, pronotum with somewhat smaller punctures than those on head.

Elytra and abdomen. Elytra (Fig. 72) dilating posteriorly, behind scutellum rather deeply impressed. Medially serrate fringe (Fig. 28) present on hind margin of tergite VII. Elytral punctation not umbilicate, size a tiny bit finer than on head and pronotum, interspaces about 1/3 of puncture diameters. Bases of abdominal tergites (posterior to basal ridges) with transversal coriaceous microsculpture, posteriorly obscured, segments with a few small, scattered punctures. Aedeagus as in Fig. 89.

ETYMOLOGY: The species is named after being the largest known species of the genus.

COMPARATIVE NOTES: From the similarly large 'unicoloured' species ( P. longicornis , P. major , P. unicoloratus ), it can be distingiushed by the moderately elongate antennae, the rather flat head with well noticeable depression at the vertex. Contrary to the most similar P. unicoloratus its shoulders are not lighter than the rest of the elytra and the punctation on the head and pronotum is more coarse.

DISTRIBUTION: The species is known only from a single locality in the northern part of Colombia (Dept. Magdalena).

BIONOMICS: No bionomical information is available for the type specimens.